Lock for sheet-metal pipes



w. o. ORONEMEYER. LOOK FOR SHEET METAL PIPES- No. 564,147.. v v PatentedJuly 14, 1896;

UNITED STATES PATENT OFFICE.

IVILLIAM ORONEMEYER, OF VERSAILLES, PENNSYLVANIA.

LOCK FOR SHEET-METAL PIPES.

SPECIFICATION forming part of Letters Patent No. 564,147, dated July 14,1896.

Application filed March 20,1896.

To all whom it may concern.-

Be it known that I, WILLIAM G. CRONE- MEYER, a citizen of the UnitedStates, residing in Versailles township, in the county of Allegheny andState of Pennsylvania, have invented certain new and useful Improvementsin Looks for Sheet-Metal Pipes; and I do hereby declare the followingtobe a full, clear, and exact description of the invention,

' I 0 such as will enable others skilled in the art to which itappertains to make and use the same.

My invention has relation to lock-seams for sheet-metal pipes, and hasfor its object the provision of a novel form of lock which Is may bereadily and simply constructed out parts hereinafter described andclaimed.

In the accompanying drawings, illustrat-. mg my invention, Figure 1 is aplan view of a flat sheet of the metal from which the pipe is to beformed. Fig. 2 is a perspective view ll of the same sheet formed up, but.with the seams unjointed. Fig. 3 is a perspective view showing the pipein the position assumed when the folded edges have been joined andbefore looking. Fig. 4 is a perspective view showing the completesection of the pipe ready for use. Fig. 5 is an end view of the finishedpipe-section shown in Fig. 4.

In forming my improved look I take the flat sheet of metal shown in Fig.1 of the drawings and cut a slit a 19 near the upper corner of that sidewhich is to form the outturned edge of the pipe. I then fold the edge de of the sheet outwardly from the slit a b to the bottom of the sheetand fold the edge f g of the sheet inwardly, and then form up the sheetto the cylindrical or other desired shape, and then bend the tang ortongue h, which is left between the slit a b and the upper edge of thesheet, twice at right angles, or substantially so, so that the tonguehwill project upon the outside of the inwardly-turned edge f g when thepipes are p Serial No. 584,122. on model.)

joined together, as shown in Fig. 5. If nec essary or desirable, aportion of the inwardlyturned edge f g is cut off on the dotted line 'iis Z, so as to give a sharp bearing edge for the tongue h.

When the sheet has been formed up, as described, to the shape showninFig. 2, the inwardly-turned edge f g is slipped over theoutwardly-turned edge 01 6, so as to lock with the outwardly-turnededge, the pipe being skewed, as shown in Fig. 3, so that the tongue 72.is above the adjacent edge f g, and the pipe is then straightened,bringing the tongue down over and outside the edge f g to the positionshown in Figs. 4 and 5 and complet ing the locking of the seam. Thepeculiar shape of the tongue is such that it opposes a shoulder to theadjacent inwardlyturned edge f g, and also embraces the edge, so as toprevent the locked edges from disengaging or collapsing when in service.

The pipe-lock constructed as described is cheap, adding little ornothing to the cost of manufacture. The operation of locking up the pipeis effected without trouble, and the lock described constitutes a simpleand effective fastening device for the end of the seam and obviates theemployment of rivets or other devices for preventing collapse of theadjacent joined ends of the pipe-sections.

Having described my invention, I claim- A section of stovepipe made froma sheet of metal having a transverse slit a I) out near one of its ends,forming a tongue h, which is bent twice at right angles, thelongitudinal edge of the sheet wherein said slit is out being bent orbeaded outwardly as at d e and the other edge bent or beaded inwardly asat f g to form an interlocking joint the slit a U being cut deeper thanthe width of the bead cl 6 and the parts being so arranged that when thelongitudinal edges interlock, the shoulder of the tongue 71, will opposethe inwardlyturned edge of the sheet and the projecting portion overlapsaid edge on the outside, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM C. ORONEMEYER. Witnesses:

DANIEL STRAT'ION, WM. SIEBER.

